Count down to the autumn equinox and see exactly how many days, hours, and minutes until fall begins. Plan your fall activities, seasonal preparations, and cozy autumn adventures.
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Days Until Fall
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Days remaining
Hours Until Fall
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Minutes Until Fall
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Current Date
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Today's date
Fall Equinox
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Target date
🍂 How Many Falls Until a Future Date?
Enter any future date to see how many autumnal equinoxes (fall seasons) will occur between now and then.
Fall Seasons
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Autumnal equinoxes until target date
Target Date
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Your selected date
Next Fall
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The next autumn equinox
🍁 Understanding the Seasons
The autumnal equinox marks the astronomical beginning of fall in the Northern Hemisphere. It occurs when the Sun crosses the celestial equator moving southward, resulting in nearly equal lengths of day and night across the globe.
📅 When Is Fall?
The autumnal equinox typically falls on September 22 or 23 each year. This date can shift slightly due to the Earth's elliptical orbit and the Gregorian calendar.
🌍 Equal Day & Night
"Equinox" comes from Latin meaning "equal night." During the equinox, the Sun is directly above the equator, giving nearly 12 hours of daylight and 12 hours of darkness.
🍁 Seasonal Changes
Fall brings cooler temperatures, changing leaf colors, harvest time, and shorter days. It's a transitional season between summer's heat and winter's cold.
🌎 Southern Hemisphere
In the Southern Hemisphere, the September equinox marks the beginning of spring, not fall. The seasons are reversed south of the equator.
Why Does the Date Vary?
The autumnal equinox doesn't fall on the exact same date every year. It can occur on September 21, 22, 23, or 24, though September 22 is most common. This variation happens because the Earth's orbit around the Sun takes approximately 365.25 days, and the calendar year adjusts with leap years to keep things synchronized.
Fall Fun Facts
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New England's fall foliage attracts millions of tourists each year, with peak colors typically appearing from late September through mid-October.
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The word "autumn" comes from the Latin word autumnus, while "fall" dates back to the 16th century and likely comes from "fall of the leaf."
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Many cultures celebrate harvest festivals around the autumnal equinox, including Thanksgiving in Canada, Mid-Autumn Festival in China, and Oktoberfest in Germany.
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Fall Countdown
See exactly how many days, hours, and minutes remain until the autumn equinox — updated in real time.
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Season Forecast
Find out how many fall seasons will pass between now and any future date you choose.
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DST-Safe Logic
Our calculator uses precise day-boundary calculations to handle daylight saving time transitions correctly.
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Fall Education
Learn about the autumnal equinox, why leaves change color, and how fall is celebrated around the world.
The autumnal equinox is an astronomical event that marks the official beginning of fall (autumn) in the Northern Hemisphere. It occurs each year around September 22 when the Sun crosses the celestial equator from north to south. On this day, the length of day and night are nearly equal — the word "equinox" comes from the Latin aequus (equal) and nox (night).
After the autumnal equinox, days grow progressively shorter and nights longer as the Northern Hemisphere tilts away from the Sun. This shift continues until the winter solstice in December, after which days begin to lengthen again. The changing angle of sunlight is what causes the cooler temperatures and the spectacular color changes in deciduous trees.
Meteorological vs. Astronomical Fall
There are actually two ways to define the start of fall. Astronomical fall begins on the autumnal equinox (September 22), based on the Earth's position relative to the Sun. Meteorological fall is simpler and more consistent for record-keeping — it always starts on September 1 and lasts through November, dividing the year into four equal three-month seasons. This calculator uses the astronomical definition based on the autumnal equinox.
Why Count Down to Fall?
Knowing exactly when fall begins helps you plan for the season ahead. Here are some popular reasons people track the countdown:
🍎 Harvest Planning
Farmers and gardeners plan their harvest around the changing seasons. Fall marks the end of the growing season for many crops.
🎒 School & Activities
Fall coincides with the start of the school year for many. Count down to seasonal sports, festivals, and outdoor events.
🏡 Home Preparation
Get your home ready for cooler weather — winterize your garden, service your heating system, and prepare for seasonal changes.
✈️ Travel Planning
Fall is prime time for leaf-peeping trips, harvest festivals, and outdoor adventures before winter sets in.
Frequently Asked Questions
When exactly does fall start each year?
Fall (the autumnal equinox) typically falls on September 22 or 23 in the Northern Hemisphere. The exact date can vary between September 21 and 24 depending on the year. Our calculator uses September 22 as the standard date and calculates the countdown from today's date to the next occurrence.
How is the days-until-fall calculation affected by daylight saving time?
Our calculator uses Math.round() for day boundary calculations, which makes it safe across daylight saving time transitions. Unlike Math.ceil(), which could add an extra day during DST shifts, rounding ensures that the countdown remains accurate regardless of clock changes in spring or fall.
What's the difference between the autumnal equinox and the fall season?
The autumnal equinox is the precise astronomical moment when the Sun crosses the equator, marking the beginning of fall. The fall season is the three-month period between the autumnal equinox and the winter solstice (approximately September 22 to December 21). Meteorological fall runs from September 1 to November 30 for consistent record-keeping.
Does the calculator work for the Southern Hemisphere?
This calculator shows the countdown to the September equinox, which is the autumnal equinox in the Northern Hemisphere and the vernal (spring) equinox in the Southern Hemisphere. If you're in the Southern Hemisphere, the countdown shown here represents the days until spring rather than fall.
How many fall seasons will I experience in the next 10 years?
You can use our Seasons Forecast tab to calculate exactly how many fall seasons (autumnal equinoxes) will occur between today and any future date. Simply enter your target date and the calculator will count how many September 22 events fall within that range. For most years, you'll experience one fall per year, so in 10 years you'll typically see 10 autumnal equinoxes.
Why do leaves change color in the fall?
As days get shorter and temperatures cool, chlorophyll (the pigment that makes leaves green) breaks down. This reveals other pigments that were always present — carotenoids (yellow and orange) and anthocyanins (red and purple). The intensity of fall colors depends on weather conditions, with bright, sunny days and cool nights producing the most vibrant displays.